-1的變形條件下，利用Gleeble熱模擬試驗機研究了粉末冶金工藝制備的新型高鎢合金鋼的熱變形行為。結果表明：高鎢合金鋼的流變應力隨應變率的降低和變形溫度的升高而降低。構建高鎢合金鋼的Arrhenius雙曲正弦函數(shù)本構方程及熱加工圖，得到高溫變形激活能為377 kJ/mol，最佳變形工藝參數(shù)區(qū)間為1000~1100 ℃/0.001~0.01 s-1。高溫變形過程中，試樣中有富鎢μ相析出，在變形鼓脹區(qū)有微孔洞與微裂紋產生，數(shù)量隨變形應變率的升高和溫度的降低而增加，裂紋沿析出相萌生并擴展。同時μ相的析出提高了合金鋼的高溫強度。"/>

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粉末冶金高鎢合金鋼熱變形行為與加工圖
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1.北京理工大學 材料學院，北京 100081;2.北京理工大學 沖擊環(huán)境材料技術國家級重點實驗室，北京 100081

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Characterization of Hot Deformation Behavior and Pro-cessing Map of Powder Metallurgical High-Tungsten Steel
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1.School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2.National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China

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    摘要:

    在溫度為900~1100 ℃、應變速率為0.001~1 s-1的變形條件下，利用Gleeble熱模擬試驗機研究了粉末冶金工藝制備的新型高鎢合金鋼的熱變形行為。結果表明：高鎢合金鋼的流變應力隨應變率的降低和變形溫度的升高而降低。構建高鎢合金鋼的Arrhenius雙曲正弦函數(shù)本構方程及熱加工圖，得到高溫變形激活能為377 kJ/mol，最佳變形工藝參數(shù)區(qū)間為1000~1100 ℃/0.001~0.01 s-1。高溫變形過程中，試樣中有富鎢μ相析出，在變形鼓脹區(qū)有微孔洞與微裂紋產生，數(shù)量隨變形應變率的升高和溫度的降低而增加，裂紋沿析出相萌生并擴展。同時μ相的析出提高了合金鋼的高溫強度。

    Abstract:

    Hot deformation behavior of powder metallurgical high tungsten alloy steel was investigated by Gleeble thermal simulator in a temperature range of 900~1100 °C and a strain rate range of 0.001~1 s-1. The results show that the flow stress decreases with the decrease of strain rate and the increase of deformation temperature. A constitutive equation is derived with Arrhenius hyperbolic sine function, and a processing map is constructed. The activation energy is 377 kJ/mol. The suitable processing regions are 1000~1100 °C/0.001~0.01 s-1. The precipitation of tungsten-rich μ phase occurs during hot deformation process. Microvoids and micro-cracks form in the bulging region of the specimen. The amount of microvoid increases with the increase of strain rate and the decrease of temperature. The μ phase precipitation improves the high temperature strength of the steel.

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劉安晉,王琳,程興旺,熊志平,寧子軒.粉末冶金高鎢合金鋼熱變形行為與加工圖[J].稀有金屬材料與工程,2021,50(12):4201~4208.[Liu Anjin, Wang Lin, Cheng Xingwang, Xiong Zhiping, Ning Zixuan. Characterization of Hot Deformation Behavior and Pro-cessing Map of Powder Metallurgical High-Tungsten Steel[J]. Rare Metal Materials and Engineering,2021,50(12):4201~4208.]
DOI：10.12442/j. issn.1002-185X.20200733

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  • 收稿日期:2020-09-20
  • 最后修改日期:2021-02-07
  • 錄用日期:2021-02-09
  • 在線發(fā)布日期: 2021-12-30
  • 出版日期: 2021-12-24